rocketmq-client4cpp/src/consumer/MessageQueueLock.h

/**
* Copyright (C) 2013 kangliqiang ,kangliq@163.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

#ifndef __MESSAGEQUEUELOCK_H__
#define __MESSAGEQUEUELOCK_H__

#include <map>
#include "Mutex.h"
#include "ScopedLock.h"
#include "MessageQueue.h"

namespace rmq
{
    class MessageQueueLock
    {
    public:
        MessageQueueLock()
        {

        }

        ~MessageQueueLock()
        {
            std::map<MessageQueue, kpr::Mutex*>::iterator it = m_mqLockTable.begin();

            for (; it != m_mqLockTable.end(); it++)
            {
                delete it->second;
            }
        }

        kpr::Mutex* fetchLockObject(MessageQueue& mq)
        {
            kpr::ScopedLock<kpr::Mutex> lock(m_lock);
            std::map<MessageQueue, kpr::Mutex*>::iterator it = m_mqLockTable.find(mq);
            kpr::Mutex* objLock;
            if (it == m_mqLockTable.end())
            {
                objLock = new kpr::Mutex();
                m_mqLockTable[mq] = objLock;
            }
            else
            {
                objLock = it->second;
            }

            return objLock;
        }

    private:
        std::map<MessageQueue, kpr::Mutex*> m_mqLockTable;
        kpr::Mutex m_lock;
    };
}
#endif